Debugging.h

# define ALog(format, ...) NSLog((@"%s [L%d] " format), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);

# ifdef DEBUG
#  define DLog(format, ...) ALog(format, ##__VA_ARGS__);
# else  
#   define DLog(...)  
# endif

NSString *test = @"test";
DLog(test);

This code are not work.

You should use:
NSString *test = @"test";
DLog(@"test = %@", test);

First argument is format.